Improvement in blind-rack



as employed in such a machine,

` dluitmltate @anni tjljiiw.

CHARLES E. SMITH, OF GOFFSTOWN., NEW HAMlSHIRE.-

Letters Patent No. 96,980, dated Norentber 16, 1869.

IMPROVEMENT IN BLIND-RACK.

'lhe Schedul.. referred to in these Letters Patent and making part of the lame.

To all persons to whom these presents may'come:

Be it known that I, CHARLES. E. SMITH, of Golfstown, of the county ot' Hillsborough, and State of New Hampshire, have invented a new and usefulBlind- Rack;- and do herehydeclare the same to be fully Y described in the following specification, and represented in the accompanyingdrawings, of which- Figure 1 is a top view;

Figure 2, a transverse section Figure 3, a horizontal and longitudinal section; and

Figure 4, a vertical and longitudinal section of it.

This rack is intended for use in a machine for inortising the stiles or side bars of window-blinds, the mortises made in such stiles being generally disposed at equal distances apart furthe' reception ot' the ends of a series of slats.

Instead of the common rack, with stationary teeth, I make use of a rack having adjustable teeth, Y

teeth, and constructed so as to enable them all to be moved at once, either toward or away from one another, in order thattheir distances asuuder may be varied as occasion may require, the teeth, under any such 'ariations, heilig preserved atequal distances apart.

In 'the drawingsa. a a ay represent the series of adjustable teeth, they being project-ed from a lazy-tongs, A, arranged within a carrier, B.

The said carrier is a long tube, having a rectangular section, and being made with a slot, 1J, extending lengthwise through the middle of one of its sides.

'or in other words, a mech-` 'anisni combined with sueh Another and shorter slot, c, is also formed through the opposite side, and n ear to one end of the carrier.

The lazy-tongs has one end pivoted to the carrier. From the other end of the tougsa male screw, d, proiects, nut, e, screwed upon such screw, serves to clamp the adjacent end of the lazy-tongs in position.

The several teeth a a a a are arranged at equal distances asunder, and with their centres at or over the decussations otl the bars g h, of the lazy-tongs, such teeth usually constituting the middle joint pins of the tongs.

By moving the free end of toward or away from the other simultaneously adjusted, either nearer or further from one another; in other words, the distances between the several teeth, though always equal to each other, may all be either increased or diminished at once, as occasion may require.

By this method of adjusting the teeth, the distances asumier ofthe mortises oft-he Stiles may be regulated as may be required, for blinds ot' different lengths, as will be understood by those versed in the construction and use of the blind-stile xnortisiug-inachiue, for which the, -rack is intended.

I claim, as my invention- VThe combination and arrangementof the lazy-tongs, and its clamp-screw and nut, with the series of teeth, and the slotted carrier, substantially as specified.

- f CHAS. F. SMl'llI.

the lazy-tongs either end, the teeth may be Witnesses:

It.. H. EDDY, S. N. Pirna.

and extends through the shorter slot c. A 

